Compound die for punching sheet members from circular blanks in punch pressers with vertical disposition of blanking planes

ABSTRACT

Compound dies for punching sheet members from circular blanks in punch presses with a vertical disposition of the blanking planes. The compound die has a movable plate provided with punches, a lifter for removing a completed member and a means for centering the blank relative to the female die. The female die is arranged on a stationary plate the lower portion of which is provided with supports for holding the blank on the stationary support. The stationary plate has a device for holding the blank against the face of the female die comprising at least two movable holder. These holders are positioned in the blanking plane in opposite relationship and along an axis perpendicular to the direction of movement of the blank.

United States Patent Gilev et al.

15] 3,656,381 1 Apr. 18, 1972 Inventors: Vitaly Konstantinovich Gilev,proezd, 65,

Filed:

kv. 16.; Volt Nakhimovich Evzlin, ulitsa Chapaeva, 102, kv. 53.; GennadyNikolaevich Kamalov, prospekt Kirova, 30, kv. 57.; Rafael TevosovlchSarkisov, ulitsa dga-Nematully, 20a, blok 3, kv. 28.;

Ernst Arakelovich Stephanian, ulitsa Druzhby Molod ezhi, 2, kv. 36.;Rustam Makhmud Ogly Shakhmaliev, prospekt Nefti, 24, kv. 8., all ofBaku, U.S.S.R.

Oct. 31, 1969 Appl. No.: 872,872

[56] References Cited UNITED STATES PATENTS 2,101,083 12/1937 Mercer..83/446 X 2,466,436 4/ 1949 Jones ..'.83/228 3,034,388 5/1962Stoothofi' et al..... 83/373 UX Primary Examiner-James M. MeisterAttorney-Waters, Roditi, Schwartz & Nissen [5 7] ABSTRACT Compound diesfor punching sheet members from circular blanks in punch presses with avertical disposition of the blanking planes. The compound die has amovable plate provided with punches, a lifter for removing a completedmember and a means for centering the blank relative to the female die.The female die is arranged on a stationary plate the lower portion ofwhich is provided with supports for holding the blank on the stationarysupport. The stationary plate has a device for holding the blank againstthe face of the female die comprising at least two movable holder. Theseholders are positioned in the blanking plane in opposite relationshipand along an axis perpendicular to the direction of movement of theblank.

2 Claims, 5 Drawing Figures COMPOUNDDIE FOR PUNCI-IING SHEET MEMBERSFROM CIRCULAR BLANKS IN PUNCH PRESSERS WITH VERTICAL DISPOSITION OFBLANKING PLANES The present invention relates to presses with a verticaldisposition of the blanking planes employed for punchingconcentrically-shaped sheet members from circular blanks and, moreparticularly, the invention relates to compound dies used in suchpresses. The proposed dies can be used for punching rotor laminations ofinduction motors.

Known in the art is an automatic punch press with at least two dieslocated one above the other so that their blanking planes are positionedin one vertical plane. This press is suitable for punching out a sheetmember in the lower die from a circular blank fed therein from the upperdie. In this punch press the lower die is made in the form of aconventional compound die comprising a stationary plate with a femaledie and supports arranged in the lower portion of the plate and holdingthe blank on the female die and a movable plate carrying punches, alifter for removal of a ready article and means for centering the blankrelative to the female die.

However, this die was mainly utilized for the blanking in a horizontalor slightly sloping position, i.e. at the horizontal or slightlyinclined blanking planes.

A setting of the known die in such a manner that its blanking planes arepositioned vertically does not provide for holding a circular blank onthe surface of the female die when said blank is fed into the die fromabove. The blanks can drop out during the opening of the die.

An object of the invention is to provide such a compound die withvertically disposed blanking planes for punching sheet members fromcircular blanks, preferably laminations of mag netic circuits ofelectric machines by means of a punch press which will make it possibleto hold the circular blanks, fed into the die from above, against thevertical surface of the female die.

Another object of the invention is to provide such a die which will notallow the blanks to fall out from the open die and to keep them centeredrelative to the center of the female die.

These and other objects of the invention are attained by providing a diefor punching sheet members from circular blanks in punch presses with avertical disposition of the blanking planes comprising a stationaryplate with a female die and supports located in the lower portion of theplate and holding the blank on the female die and a movable platecarrying punches, a lifter for removing a completed member, and anattachment for centering the blank relative to the female die; accordingto the invention, the stationary plate is provided with a devicecomprising at least two movable holders disposed within the blankingplane opposite each other and along can axis perpendicular to thedirection of movement of the blank, said holders being used for holdingthe blank against the face of the female die.

It is expedient that each of the movable holders is made in the form ofa spring-loaded wedge carrying an S-shaped plate whose lower end is benttowards to the face of the female die and the upper end is bent in theopposite direction.

It is also expedient that the movement of each holder is carried outdepending on the travel of the movable plate of the die by means of awedge-shaped lever one end of which is rigidly secured to the movableplate, while the other end is in a direct contact with the holder whenthe plates approach one another.

Such a construction provides for the possibility of automaticallypunching sheet members from circular blanks in punch presses withvertical blanking planes by means of holding the circular blanks, fedinto the die from above, on the face of the female die and by preventingthe blanks from a premature fallout from the blanking zone and bycentering the blank relative to the center of the female die.

This becomes possible due to the fact that the movable holders withS-shaped plates hold the circular blanks, fed into the die from above,on the surface of the female die up to the movement of such an approachof the movable and stationary plates moving towards each other when thefall-out of the blank is impossible.

Other objects and advantages of the invention will be apparent from adescription of a preferred embodiment of the invention in the form of adie for punching rotor laminations of induction motors from circularblanks, reference being made to the appended drawings, in which.

FIG. 1 is a plan view of the die according to the invention in ahorizontal section;

FIG. 2 is a view along the arrow A in FIG. 1 part of the die);

FIG. 3 shows a device for holding a blank on the face of the female diein sectional view taken along the line IIIIII in FIG. 2;

FIG. 4 is the same view taken along the line indicated by the arrow B inFIG. 2; and

FIG. 5 is a view taken along the line indicated by the arrow C in FIG. 1showing the movable part.

The proposed compound die comprises a stationary plate 1 (FIG. 1) and amovable plate 2 interconnected by columns 3. One end of each column 3 isrigidly connected to the stationary plate 1, while the other end ismounted in ball bearings 4 of a bushing 5 rigidly connected to themovable plate 2.

The stationary plate 1 carries a female die 6 and a holding device 7 forholding the blank on the face of the female die.

The female die 6 consists of a central portion 8 used for punching ashaft aperture and vent openings in the rotor lamination. Located aboutthe central portion 8 are sectors 9 used for punching slots in the rotorlamination. The members of the female die, i.e., the central portion 8and the sectors 9 are secured in the female die holder 10 by means ofscrews (not shown) and a ring 11.

Mounted on the ring 11 in the lower portion thereof is a pair ofsupports 12 (FIG. 2) supporting the blank from below when the latter isnear the female die.

The device 7 for holding the blank against the face of the female diecomprises two holders located in the blanking plane opposite to eachother and along an axis perpendicular to the direction of movement ofthe blank. Each of these holders consists of a support 13 secured to thering 11 and bearing thereupon by means of an additional support in theform of a screw 14 (FIG. 1). Mounted on the support 13 (FIGS. 3 and 4)is a wedge 15 loaded by a spring 16. The wedge 15 carries an S-shapedplate 17. The lower end 18 of the plate 17 is bent towards to the faceof the female die 6, while the upper end 19 of the plate 17 is bent awayfrom the face of the female die so that the circular blanks, fed fromabove, slide to the face of the female die and are held there up to themoment of punching.

Pins 20 and 21 limit the travel of the wedge 15 with the plate 17.

Placed above the stationary plate 1 (FIG. 2) is a guide chute 22defining a slit somewhat tapering to the bottom both in thickness andwidth. The guide chute 22 guides the blank deposited from above to theface of the female die and directs the blank to the holders of thedevice 7.

The movable plate 2 (FIG. 1) is provided with a punch holder 23 carryingpunches 24 for punching slots, punches 25 for punching vent openings anda punch 26 for punching a central shaft aperture in the blank, thustransforming the blank into a rotor lamination of an induction motor.

Rigidly fixed in the center of the punch 26 is a device 27 for centeringthe blank relative to the female die, said device being in the form of arounded conical pin. The pin diameter corresponds to the size of thecentral opening of the circular blank fed into the die.

The movable plate 2 also carries a lifter 28 for removing a completedrotor lamination from the punches 24, 25 and 26. The lifter 28 iscapable of moving relative to the punches 24, 25 and 26, for whichpurpose it is provided with respective openings. The openings of thelifter 28 corresponding to the punches 24 have a plastic insert 29designed for reducing the (the stationary friction between the movableparts, for providing an additional support for the punches 24 and forincreasing the accuracy of punching the slots.

The lifter 28 is connected to pushers 30 bearing upon a ring 31associated with the mechanism (not shown) of the punch press whichsynchronizes the removal of the completed rotor laminations with thetravel of the slides.

The lifter 28 is provided with a mechanism in the form of spring-loadedpushers 32 for separation of the completed rotor laminations from thesurface of the lifter 28.

A pair of wedge-shaped levers 33 is rigidly mounted in the movable plate2. The end 34 of each lever 33 is in direct contact with thecorresponding wedge 15 of the device 7 during the travel of the platestowards each other (as shown in FIG. 4). I

The proposed die operates as follows.

A circular blank 35 (FIG. 2) with a central opening is fed into the diefrom above, passing through the guide chute 22 which moves the blankclose to the face of the female die and directs it into the holders ofthe device 7.

In the die, the blank is supported by the supports 12 close to the faceof the female die 6 by means of the S-shaped plates 17.

When the movable plate 2 (FIG. 1) approaches the stationary plate 1, thecolumns 3 move within the ball bearings 4 of the bushing 5, and the end34 of each lever 33 contacts a corresponding wedge 15 of the device 7and to some extent moves the holders with the S-shaped plates 17 to theperiphery of the stationary plate 1. At the same time, the mechanism 24enters the central opening of the circular blank, thus accuratelycentering the blank relative to the punching parts of the die.

Now the movable plate 2 is so close to the stationary plate I that afall-out of the circular blank, bearing on the supports 12, from theblanking zone is practically impossible, and the lifter 28 presses theblank against the face of the female die. The lifter 28 is provided withrecesses 36 (FIG. preventing it from contact with the supports 12 andholders of the device 7.

When the plates 1 and 2 (FIG. 1) are completely closed, the punches 24enter the sector 9, thus punching slots in the circular blank, thepunches 25 and the punch 26 enter the openings of the central portion 8of the female die 8, thus punching vent openings and shaft aperturerespectively so that the circular blank is transformed into a rotorlamination of an induction motor.

The scrap produced by the punching of the slots, vent opening andcentral aperture drop through the holes 37 provided in the stationaryplate 1.

In the process of punching during the approach of the plates 1 and 2 andthe interaction of the punches 24, 25 and 26 with the blank and femaledie 6, the lifter 28 moves relative to the punches 24, 25 and 26approaching the punch holder 23.

When the movable plate 2 moves away from the stationary plate 1, thecompleted rotor lamination 38 remains on the punches 24, 25 and 26. Whenthe plates 1 and 2 separate almost completely, the device of the punchpress synchronizing the removal of the completed articles with themovement of the sliders through the ring 31 and pusher 30 acts upon thelifter 23 returning it to the initial position. While returning to theinitial position the lifter 28 removes the completed rotor laminationfrom the punches 24, 25 and 26. The pushers 32 of the lifter 28 separatethe completed rotor lamination from the lifter surface, and the rotorlamination slides away from the lifter onto a mechanism (not shown) fortransportation of the completed lamination to an assembly line.

We claim:

1. A compound die for punching sheet members from circular blanks inpunch presses with a vertical disposition of the blanking plane, saiddie comprising: a stationary plate, a movable plate opposite saidstationary plate, a female die positioned on said stationary plate,supports located in the lower portion of said stationary plate forsupporting a blank on the stationary plate, punches positioned on saidmovable plate, a lifter for removlng a completed member positioned onsaid movable plate, means on said movable plate for centering said blankrelative to said female die, a device on the stationary plate forholding the blank against the face of said female die, said deviceincluding at least two movable holders located in the blanking plane inopposite relationship and along an axis perpendicular to the directionof movement of said blank, each movable holder comprising aspring-loaded wedge carrying an S-shaped plate the lower end of which isbent towards the face of the female die and the upper end of which isbent in the opposite direction.

2. A compound die according to claim 1 comprising means for the movementof each of the holders including a wedgeshaped lever having one endwhich is rigidly secured to the movable plate and an opposite end whichdirectly contacts said wedge during the approach of the movable platetowards the stationary plate. 7

1. A compound die for punching sheet members from circular blanks inpunch presses with a vertical disposition of the blanking plane, saiddie comprising: a stationary plate, a movable plate opposite saidstationary plate, a female die positioned on said stationary plate,supports located in the lower portion of said stationary plate forsupporting a blank on the stationary plate, punches positioned on saidmovable plate, a lifter for removing a completed member positioned onsaid movable plate, means on said movable plate for centering said blankrelative to said female die, a device on the stationary plate forholding the blank against the face of said female die, said deviceincluding at least two movable holders located in the blanking plane inopposite relationship and along an axis perpendicular to the directionof movement of said blank, each movable holder comprising aspring-loaded wedge carrying an Sshaped plate the lower end of which isbent towards the face of the female die and the upper end of which isbent in the opposite direction.
 2. A compound die according to claim 1comprising means for the movement of each of the holders including awedge-shaped lever having one end which is rigidly secured to themovable plate and an opposite end which directly contacts said wedgeduring the approach of the movable plate towards the stationary plate.